[COMMITTED 21/30] ada: Unreferenced warning on abstract subprogram

["Marc Poulhiès" <poulhies@adacore.com>]

From: Justin Squirek <squirek@adacore.com>

This patch modifies the unreferenced entity warning in the compiler to avoid
noisily warning about unreferenced abstract subprogram.

gcc/ada/

	* sem_warn.adb (Warn_On_Unreferenced_Entity): Add a condition to
	ignore warnings on unreferenced abstract subprogram.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_warn.adb | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/gcc/ada/sem_warn.adb b/gcc/ada/sem_warn.adb
index 2de3f8668b0..91a57d521d1 100644
--- a/gcc/ada/sem_warn.adb
+++ b/gcc/ada/sem_warn.adb
@@ -4452,12 +4452,16 @@ package body Sem_Warn is
                  ("?u?literal & is not referenced!", E);
 
             when E_Function =>
-               Error_Msg_N -- CODEFIX
-                 ("?u?function & is not referenced!", E);
+               if not Is_Abstract_Subprogram (E) then
+                  Error_Msg_N -- CODEFIX
+                    ("?u?function & is not referenced!", E);
+               end if;
 
             when E_Procedure =>
-               Error_Msg_N -- CODEFIX
-                 ("?u?procedure & is not referenced!", E);
+               if not Is_Abstract_Subprogram (E) then
+                  Error_Msg_N -- CODEFIX
+                    ("?u?procedure & is not referenced!", E);
+               end if;
 
             when E_Package =>
                Error_Msg_N -- CODEFIX
-- 
2.45.1